Quick Customize Shopify Buy Button

I need some customization on Shopify buy button (NOT store or Theme – just buy button).

I set to have variants as buttons. I have a list variants and I want to only show buttons related to available variants.

For example: I have 3 options (Pieces – Color – Size)

1 piece – 4 Piece – 5 piece

Red – Blue – Yellow

60 inch – 80 inch

In the backend of Shopify, I can set variants that are available to purchase. The issue with Shopify is that it does not hide buttons that are not available, it only shows add to cart button as “Unavailable” if you select a combination that is not available.

I want to the code to hide and show buttons based on the available combinations. If I select 1 piece, only colors and sizes available will display and other gets hide.

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Other thing that I would like to implement is embedding the cart in a single page. I don’t know if Shopify allows this through their code or not. So instead of having a sliding in cart I want it to be as static in a separate page.